Smelting-furnace.



U. W. MUNSON.

SMELTING FURNAGE.

APPLICATION FILED Nov.

' Patented Feb?, 1911.

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SMELTING FURNAGE. 'APPLIOATION FILED Nov. 6, `1905.

983,833. Patented Feb. '7, 1911.

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form such as commonly employed with water-jacketed furnaces. Thesections may be secured together and to the wall 21 by suitable means,such as a band indicated at 24 in Fig. l.

Each water-jacketed section, when constructed as shown in Figs. 1, 2, 4,5, 6 and 7 comprises an upper portion 25 and a lower portion 26 at anobtuse or other suitable angle thereto, so that when six of suchsections are assembled as in Figs. l and 2, the lower portion of thechamber inclosed by said sections flares or spreads outwardly, thusgiving an enlarged hearth area, with inwardly sloping upper walls atsuch an angle that when ore is piled on the hearth even to a height thatwill reach the angle of where the po-rtions 25 and 26 meet, the naturalincline of fall of the sides of the pile or heap of ore will not reachthe inner surface of said sloping walls. Preferably each section isformed with a lower edge portion 27 to rest on the side 21 of the hearthsection, which portion 27 is parallel with the portion 25 althoughoff-set therefrom by the intervening inclined or flaring portion 26, orthis part 27 of the section may be extended downward to form the hearth'section 2l as above mentioned. Said inclined or Haring portion is formedwith a twyer opening (or a plurality of such openings as in Figs. 8 and9) to receive the air blast through tubes or nozzles 2S from a suitablesource of supply of heated air, such as a hot-air box 29 surrounding thebrick work part 30 of the furnace resting on the metallic sections. Thesupply of hot air at the. proper temperature may be obtained by means ofsuch apparatus as disclosed in U. S. Patent 720,257 granted F eb. 10,1903, to Koch and MacDonald. If desired an inclosing band 31 maysurround the joint between the upper ends of the metallic sections andbrickwork, which band may, of course, be of any height, even to forminga complete jacket for the brickwork.

The outer end of each twyer is preferably round, as at 32, for theconnection of the tube 28, and the walls converge vertically (see Fig.5) and diverge horizontally to the inner end 33 (see Figs. 6, 7, 8 and9) so that the blast of heated air is in a practically continuous thinstream entirely around the furnace. However, twyers round at both endsmay be used if desired.

Instead of making the shoulder portions 26 of the water-jacketedsections in the form of straight inclines, they may be more or lessconcave internally, as indicated in Fig. 3. 1n other words, the outwardand downward liare of these portions 26 may be either as straight orcurved inclines. But it is essential that the Hare or incline from theangle shall be greater relatively to the vertical than the naturalincline of fall of the sides of the ore body so that when said body isfused and kept supplied with fresh charges in the manner described insaid MacDonald patent, there will always be preserved an air spacebetween the surface of the fusing mass and the mouths of the twyers,whether the hearth be supplied with ore to a point below the angle x oreven to a point above it as indicated in Fig. 3. 1f the ores are loadedup into the neck of the furnace, above the angle and the blast driveninto the air space just inside the twyers, said blast being continuousand encircling the entire ore body, the effect of such blast is topenetrate the surface of the ore body evenly and to be distributeduniformly and carry down the values into the matte or slag, saving amuch higher percentage than can be done when there is any deflectio-n ofthe blast upward, or when penetrating the ore body at separate pointsfrom the usual form of round twyers spaced apart. vWith the air space soconfined and encircling the ore-body or charge, the formation of thetwyers with widened or laterally elongated inner ends is notindispensable, as the contracted neck of the furnace so confines the airthat it is evenly distributed in said space under substantially uniformpressure at all points around the inclined sides of the charge; but Iprefer to employ twyers of the form shown and described for severalreasons, one being that their widened inner ends cause the blast to eecta more even penetration of the surface upon which it impinges and moreuniformly reduce the ore and carry the values down into the matte or Thesupply of ore may be given to the furnace by any suitable means orthrough any suitable opening at the top of the furnace (not shown), the.initial charge being preferably made, and the successive smallquantities supplied at short intervals in the manner disclosed in thePatent 746,97() above referred to.

1f the height of the charge is such that its sides do not reach the neckas indicated in Fig. l, the blast of air and the fusing Zone of fiame isconfined by the inclined surface 26 above the mouths 33 of thetwyers sothat the mantle of flame approximately follows the inclined sides of thecharge or heap and results in greater efficiency than if such blast wasblown into a body of ore, covering the twyers opening as 1s done 1nusual practice,

or was left free to rise, as in Patent 746,970.

In this case the special or elongated form of twyer described is ofgreat utility, since the entire set of twyers causes a practicallycontinuous blast around the charge or heap to penetrate the surface andcarry down the values.

A special advantage of the preservation of the confined air spaceadjacent the twyers is that said twyers are protected from the oreclogging them or the molten mass, which will always flow below them,there being, therefore, no liability of any of said twyers beingclogged, or of any of the molten mass running into them, a conditionwhich is a source of much trouble under present practice.

()wing to the construction of the hollow sections which are removable orinterchangeable, they may be readily made and shipped and then used inbuilding either a round or oblong furnace. The sections illustrated inFigs. l to 9 inclusive are segmental in cross section or horizontallycurved so that six of them can be used in making a round furnace. Byproviding sections which are horizontally straight, as indicated at 34in Fig. 10, and interposing two series of such straight sections betweenthree curved sections at each end, an oblong furnace of any length maybe builtup, the brick work and hearth section being, of course, built upto correspond.

With a furnace constructed as described, the surface of the ore-body cannever contact with the twyers, so as to obstruct them in any way,because the converging walls formed by the portions 26 of thewaterjacketed sections form a neck at m that effectually prevents anysuch spreading of the charge as would enable it to reach the twyerswhich are ,inclined inwardly and downwardly through said convergingwalls.

Having now described my invention, I claim:

l. A smelting furnace comprising a iearth and having side walls formedto maintain a heap of the ore with inclined sides from the base upward,the side walls of the furnace being contracted relatively to the hearthto form a limited and confined air space around and close to the base ofthe heap, and a plurality of twyers having laterally wide and verticallynarrow mouths close together to form practically one narrow twyerextending entirely around the furnace and in position to direct a thinstream of air at the base of the heap of ore.

2. A smelting furnace comprising a hearth and having sectionalwater-jacketed side walls formed to maintain a heap of the ore withinclined sides from the base upward, the said side walls beingcontracted relatively to the hearth to form a limited and confined airspace around the base of the heap, and a plurality of twyers havinglaterally wide and vertically narrow mouths close together to formpractically one narrow twyer extending entirely around the furnace andin position to direct a thin stream of air at the base of the heap ofore.

In testimony whereof l have affixed my signature, in presence of twosubscribing witnesses.

CORYDON WILLARD MUNSON.

Witnesses:

G. E. KEYT, DOROTHY O. GARwooD.

